Fresh pesticide residue detection equipment and use method thereof

Abstract

The invention discloses fresh pesticide residue detection equipment and a use method thereof, and belongs to the technical field of food safety detection. The equipment comprises a rack structure, a charging barrel structure I, a charging barrel structure II and a detection box body, and integrates the functions of cleaning, crushing, extracting, filtering, reacting, colorimetric analysis and the like. A sample is subjected to rotary spraying type cleaning through the cleaning structure, is crushed through the crushing structure, is mixed with an extraction liquid, is subjected to negative pressure suction filtration, and finally enters the detection module to complete enzyme inhibition reaction and colorimetric detection. A detection result is output in real time through a built-in display screen, an alarm is automatically given when the detection result exceeds the standard, and data are supported to be uploaded to a cloud platform. The equipment is compact in structure, high in function integration degree, simple and convenient to operate and suitable for rapidly detecting various pesticide residues in agricultural products such as vegetables and fruits on site, the detection efficiency and precision are improved, and the rapid detection requirements of basic layers and circulation links are met.

Description

Technical Field

[0001] This invention relates to the field of food safety testing technology, specifically to a pesticide residue testing device for fresh produce and its usage method. Background Technology

[0002] With increasing public awareness of food safety, rapid detection of pesticide residues in fresh agricultural products (such as vegetables and fruits) has become an important means of safeguarding public health. Currently, pesticide residue detection methods mainly include chromatography, mass spectrometry, and enzyme inhibition methods. While these methods are highly sensitive, the equipment is expensive, the operation is complex, and the detection cycle is long, making them unsuitable for the rapid on-site testing needs of grassroots markets, supermarkets, and households. Furthermore, existing testing equipment is not convenient for rapid, integrated, and convenient detection, resulting in low detection efficiency. Therefore, developing a highly integrated, efficient, easy-to-operate, and applicable rapid pesticide residue detection device suitable for various fresh agricultural products is of great significance. Summary of the Invention

[0003] (a) Technical problems to be solved

[0004] To address the shortcomings of existing technologies, this invention provides a pesticide residue detection device for fresh produce and its usage method, solving the problems of complex operation, long detection cycle, and poor adaptability of the detection device.

[0005] (II) Technical Solution

[0006] To achieve the above objectives, the present invention provides the following technical solution: a fresh pesticide residue detection device, comprising a frame structure, a first material cylinder structure, a second material cylinder structure, and a detection box. The frame structure includes a cast block, with connecting pipes symmetrically arranged on both sides of the cast block. The connecting pipes are connected to the corresponding first and second material cylinder structures. A support plate is provided on the top of the cast block. A cleaning structure is provided on one side of the top of the support plate, and a crushing structure is provided on the other side of the support plate. The cleaning structure includes a first upright plate, with a horizontal frame plate on the top of the first upright plate. A base plate is provided at the outer end of the horizontal frame plate. The base plate is positioned directly above the first material cylinder structure. A liquid passage pipe is provided on the top of the base plate. A control valve is provided on the base plate, and a nozzle is provided at the bottom of the base plate.

[0007] As a further preferred embodiment of the present invention, the material cylinder structure includes a bottom frame, a column cylinder at the top of the bottom frame, a directional ring at the bottom of the column cylinder, and protruding teeth on the outside of the directional ring. A motor is installed inside the bottom frame, and a gear plate is connected to the output end of the motor. The gear plate meshes with the directional ring. A slidable storage frame is installed on one outer wall of the bottom frame, and a liquid collection tray is installed inside the storage frame. A material collection mesh frame is installed inside the column cylinder, and a drain hole is installed at the bottom end of the column cylinder.

[0008] As a further preferred embodiment of the present invention, electromagnetic sliding grooves are provided on both sides of the column plate, and a steering block is slidably connected to the electromagnetic sliding groove. A motor is provided on the top of the steering block, and the output end of the motor is connected to the steering plate. A liquid storage tray is connected to the outer end of the steering plate. A liquid pump is provided inside the liquid storage tray, and a guide plate is provided at the bottom of the liquid storage tray. Several conduits are provided on the guide plate.

[0009] As a further preferred embodiment of the present invention, the second material cylinder structure includes a second column cylinder and a second bottom frame, wherein the second bottom frame is disposed at the bottom of the second column cylinder.

[0010] As a further preferred embodiment of the present invention, the crushing structure includes a second upright plate, a groove is provided on the inner wall of the second upright plate, a hydraulic cylinder is provided at the bottom of the groove, a movable plate is connected to the output end of the hydraulic cylinder, a cover plate is connected to the outside of the movable plate, a motor is provided at the top of the cover plate, a shaft tube is connected to the output end of the motor, a plurality of crushing blades are provided on the outside of the shaft tube, and an alarm is provided at the top of the second upright plate.

[0011] As a further preferred embodiment of the present invention, a second adjusting block is slidably connected to the side wall of the second column plate, a third motor is provided inside the second adjusting block, and the output end of the third motor is connected to the second adjusting plate. The outer end of the second adjusting plate is connected to a storage tray, and a negative pressure pump is provided at the top of the storage tray. An adsorption tube is connected to the bottom of the storage tray.

[0012] As a further preferred embodiment of the present invention, the top of the detection box is provided with an openable cover plate, the detection box contains a reaction chamber and a reagent chamber, and the top of the detection box is provided with a display screen.

[0013] As a further preferred embodiment of the present invention, a method of using a pesticide residue detection device for fresh produce includes the following steps: Step S1: Sample preparation, taking samples of fresh vegetables or fruits, then placing them into a material cylinder structure with a cleaning structure for thorough cleaning, and collecting the waste liquid;

[0014] Step S2: The cleaned sample is fed into the material cylinder structure two, and then the crushing structure is started to continue the crushing process. At the same time, the preset volume of extract is automatically added for filtration and separation. The homogenate is filtered through a negative pressure pump and an adsorption tube to obtain a clear test solution.

[0015] Step S3: Sample addition reaction. The liquid is placed into the detection box and introduced into the reaction chamber, where it is automatically mixed with the enzyme reagent pre-stored in the reagent compartment to carry out the enzyme inhibition reaction.

[0016] Step S4: Constant temperature reaction and colorimetric detection. After the reaction chamber reacts for a set time under constant temperature conditions, the photoelectric colorimetric module performs optical detection on each channel to obtain the colorimetric value.

[0017] Step S5: Result display and upload. The colorimetric value is compared with the built-in standard curve to automatically calculate the pesticide residue concentration and display the result on the screen. If the value exceeds the standard, an alarm will be issued.

[0018] (III) Beneficial Effects

[0019] This invention provides a device for detecting pesticide residues in fresh produce. It has the following beneficial effects:

[0020] (1) This invention integrates functions such as cleaning, crushing, extraction, filtration, reaction, and colorimetric analysis, realizing an automated closed loop from sample processing to pesticide residue detection, greatly reducing manual operation links, significantly improving detection efficiency and accuracy, with high structural integration and small footprint. The equipment adopts an integrated design and integrated installation, making effective use of space, suitable for on-site deployment and mobile detection, especially suitable for farmers' markets, supermarkets, and fruit and vegetable storage points. The detection box is equipped with a display screen, which can display colorimetric results and residue concentration judgment in real time, and can also issue sound and light alarms or wirelessly upload detection data to realize information-based supervision.

[0021] (2) The detection box of the present invention is equipped with a reaction chamber and a reagent chamber. Multi-wavelength colorimetric detection is performed through photoelectric colorimetric module, which can detect multiple types of pesticide residues at the same time, improve detection throughput and sensitivity, and is simple to operate. It is suitable for non-professional users. Users only need to place the sample according to the procedure, and the equipment can automatically complete the subsequent processing and detection, reducing the dependence on the technical level of the operator. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0023] Figure 2 This is a three-dimensional structural schematic diagram of the present invention from another perspective;

[0024] Figure 3 This is a front view structural diagram of the present invention;

[0025] Figure 4 This is a side view of the structure of the present invention;

[0026] Figure 5 This is a schematic diagram of the liquid storage tray for side cleaning according to the present invention.

[0027] In the diagram: 1. Detection box; 2. Casting block; 3. Connecting pipe; 4. Support plate; 5. Column plate 1; 6. Horizontal frame plate; 7. Seat plate; 8. Liquid passage pipe; 9. Control valve; 10. Nozzle; 11. Base frame 1; 12. Column cylinder 1; 13. Directional ring; 14. Gear disc; 15. Storage frame; 16. Liquid collection tray; 17. Material collection mesh frame; 18. Directional block 1; 19. Motor 1; 20. Directional adjustment 21. Plate 1; 22. Liquid storage tray; 23. Flow guide plate; 24. Conduit; 25. Column 2; 26. Bottom frame 2; 27. Column plate 2; 28. Hydraulic cylinder 1; 29. ​​Movable plate; 30. Shaft tube; 31. Crushing blade; 32. Adjusting block 2; 33. Adjusting plate 2; 34. Collection tray; 35. Negative pressure pump; 36. Adsorption tube; 37. Cover plate; 38. Display screen. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Please see Figure 1-5 The present invention provides a technical solution:

[0030] A pesticide residue detection device for fresh produce includes a frame structure, a first material cylinder structure, a second material cylinder structure, and a detection box 1. The frame structure includes a cast block 2, with connecting pipes 3 symmetrically arranged on both sides of the cast block 2. The connecting pipes 3 are connected to the corresponding first and second material cylinder structures. A support plate 4 is provided on the top of the cast block 2. A cleaning structure is provided on one side of the top of the support plate 4, and a crushing structure is provided on the other side of the support plate 4. The cleaning structure includes a first column plate 5, with a horizontal frame plate 6 on the top of the first column plate 5. A seat plate 7 is provided at the outer end of the horizontal frame plate 6. The seat plate 7 is located directly above the first material cylinder structure. A liquid passage pipe 8 is provided on the top of the seat plate 7. A control valve 9 is provided on the seat plate 7, and a nozzle 10 is provided at the bottom of the seat plate 7.

[0031] The material cylinder structure includes a bottom frame 11, a column cylinder 12 at the top of the bottom frame, a directional ring 13 at the bottom of the column cylinder 12, and protruding teeth on the outside of the directional ring 13. A motor is installed inside the bottom frame 11, and a gear plate 14 is connected to the output end of the motor. The gear plate 14 meshes with the directional ring 13. A sliding storage frame 15 is installed on one outer wall of the bottom frame 11, and a liquid collection plate 16 is installed inside the storage frame 15. A material collection mesh frame 17 is installed inside the column cylinder 12, and a drain hole is installed at the bottom end of the column cylinder. During use, the motor can drive the gear plate 14 to make the entire column cylinder 12 continue to rotate, and then cooperate with the cleaning structure to continue to clean thoroughly.

[0032] Electromagnetic grooves are provided on both sides of the column plate 5. An adjusting block 18 is slidably connected to the electromagnetic groove. A motor 19 is provided on the top of the adjusting block 18. The output end of the motor 19 is connected to an adjusting plate 20. A liquid storage tray 21 is connected to the outer end of the adjusting plate 20. A liquid pump is provided inside the liquid storage tray 21, and a guide plate 22 is provided at the bottom of the liquid storage tray 21. Several conduits 23 are provided on the guide plate 22. By adjusting the position of the adjusting block 18 and the external liquid storage tray 21, it can be placed into the inside of the column 21, and then the vegetable and fruit samples can be cleaned from the side to improve the cleaning effect. Some cleaning liquid or other specific reagents can also be added to the liquid storage tray 21 to improve the detection effect.

[0033] The second material cylinder structure includes a second column cylinder 24 and a second bottom frame 25. The second bottom frame 25 is located at the bottom of the second column cylinder 24, and the second column cylinder 24 is used to store fruits and vegetables that are about to be broken.

[0034] The crushing structure includes a second column plate 26, with a groove on the inner wall of the second column plate 26. A hydraulic cylinder 27 is installed at the bottom of the groove. The output end of the hydraulic cylinder 27 is connected to a movable plate 28. A cover plate is connected to the outside of the movable plate 28. A motor 29 is installed at the top of the cover plate. The output end of the motor 29 is connected to a shaft tube 30. Several crushing blades 31 are installed on the outside of the shaft tube 30. An alarm is installed at the top of the second column plate. When the hydraulic cylinder 27 is activated, the movable plate 28 and the cover plate are driven downwards and extended into the interior of the second column. Then, the motor 29 drives the shaft tube 30 and the crushing blades 31 to crush the fruits and vegetables.

[0035] A directional block 32 is slidably connected to the side wall of the column plate 26. A motor 3 is installed inside the directional block 32, and the output end of the motor 3 is connected to the directional plate 33. The outer end of the directional plate 33 is connected to the storage tray 34, and a negative pressure pump 35 is installed on the top of the storage tray 34. An adsorption tube 36 is connected to the bottom of the storage tray 34. By using the directional block 31 and the motor 3 to adjust the distance of the storage tray 34, a robotic arm is formed. The detection liquid is further adsorbed through the negative pressure pump and the adsorption tube 36 and then poured into the interior of the detection box 1.

[0036] The top of the detection box 1 is equipped with an openable cover plate 37. The detection box 1 contains a reaction chamber and a reagent chamber, and the top of the detection box 1 is equipped with a display screen 38. The interior of the detection box contains a reaction detection unit, including a reagent chamber, a microfluidic chip, a constant temperature reaction chamber, and a photoelectric colorimetric detection module, which is used for enzyme inhibition reaction and colorimetric analysis of pesticide residue concentration. The control and display unit includes an embedded main control board, a touch screen, and a data storage module, which is used to control the detection process, display the detection results, and record data.

[0037] The wireless communication module is used to upload the detection data to the cloud platform via Bluetooth or Wi-Fi for remote monitoring and data management. The top of the detection box is equipped with an openable cover (37) for opening and closing the detection chamber, facilitating the addition of the detection liquid manually or automatically. The cover has a sealing ring inside to ensure airtightness during the detection process and prevent reagent evaporation or liquid leakage. The detection liquid is fed into the reaction chamber through the adsorption tube. The reaction chamber is equipped with a microfluidic channel for precise liquid guidance to the reaction zone. The bottom of the reaction zone has a transparent material window to facilitate the passage of the colorimetric detection light path. A built-in heating element or constant temperature plate can maintain the reaction chamber within the range of 30℃~40℃ to achieve constant temperature enzyme reaction conditions. The reagent chamber contains multiple miniature independent reagent compartments for storing different types of enzyme inhibition reaction reagents. Each compartment is equipped with a controllable release valve (miniature solenoid valve or mechanical extrusion device) that releases the required volume of reagent under system control. It supports various enzymes, such as acetylcholinesterase inhibitors and peroxidases, for the identification of different types of pesticide residues. A micro-mixing structure, located between the reaction chamber and the reagent chamber, employs microfluidic channels and bubble stirring to ensure uniform mixing of the sample solution and enzyme reagents, improving the consistency and rate of the enzyme inhibition reaction. The photoelectric colorimetric detection module integrates a light source emitter (such as an LED light source) and a photosensitive receiver (such as a photodiode) below the reaction chamber. It supports multi-wavelength (such as 410nm, 450nm, 620nm) colorimetric detection to adapt to the absorption spectra of different enzyme reaction products. The module incorporates an A / D converter and noise filtering circuit to enhance detection sensitivity and stability. The data processing and control unit is equipped with an embedded microcontroller (MCU) or ARM chip within the detection box. It controls the entire detection process, including reagent release, reaction time control, light signal acquisition, and data analysis. An internal storage module records historical detection data and supports connection to an external display or touchscreen. The display and alarm module features an LCD screen (38) on the top of the detection box, which displays real-time information such as pesticide residue concentration, colorimetric value, and reaction time. When preset limits are exceeded, the system automatically activates an alarm (sound + flashing red LED). An optional barcode / QR code scanning module enables sample traceability. The communication module includes a Bluetooth or Wi-Fi module slot within the detection box, synchronizing detection results with the cloud platform for remote access by regulatory authorities. The consumables replacement and maintenance structure features a modular, replaceable structure for both the reaction chamber and reagent chamber. Users can replace the reaction chamber module after a certain number of tests, improving equipment lifespan and detection stability. A waste liquid tank at the bottom collects residual liquid after the reaction.

[0038] A method for using a pesticide residue detection device for fresh produce includes the following steps: Step S1: Sample preparation, taking samples of fresh vegetables or fruits, then placing them into the material cylinder structure and the cleaning structure for thorough cleaning, and collecting the waste liquid;

[0039] Step S2: The cleaned sample is fed into the second material cylinder structure, and then the crushing structure is started to continue crushing. At the same time, a preset volume of extract is automatically added for filtration and separation. The homogenate is filtered through the negative pressure pump 35 and the adsorption tube 36 to obtain a clear test solution.

[0040] Step S3: Sample addition reaction. The liquid is placed into the detection box 1 and introduced into the reaction chamber, where it is automatically mixed with the enzyme reagent pre-stored in the reagent compartment to carry out the enzyme inhibition reaction.

[0041] Step S4: Constant temperature reaction and colorimetric detection. After the reaction chamber reacts for a set time under constant temperature conditions, the photoelectric colorimetric module performs optical detection on each channel to obtain the colorimetric value.

[0042] Step S5: Result display and upload. The colorimetric value is compared with the built-in standard curve to automatically calculate the pesticide residue concentration and display the result on the display screen 38. If the value exceeds the standard, an alarm will be issued.

[0043] Working principle: During the cleaning process, the sample is first placed in the first material cylinder structure. The cleaning structure at the top sprays cleaning liquid through the nozzle 10 of the base plate 7. At the same time, the first column cylinder 12 rotates under the drive of the motor, and the sample is continuously tumbled in the collection mesh frame 17. Combined with the spraying of the liquid storage tray 21, the cleaning efficiency is improved. Waste liquid is discharged into the collection tray 16 through the drain hole for collection.

[0044] Sample crushing and liquid extraction

[0045] After cleaning, the sample is automatically conveyed to the second material cylinder structure. The crushing mechanism is activated, and the hydraulic cylinder pushes the movable plate 28 and the shaft tube 30 with crushing blades 31 deeper into the material cylinder to thoroughly crush the sample. At the same time, the system automatically injects the extraction liquid for homogenization. A negative pressure is created by the negative pressure pump 35, and the adsorption tube 36 draws in the filtered detection liquid.

[0046] Filtering and Transfer

[0047] The obtained detection liquid is transported to the collection tray 34 through the adsorption tube 36, and then poured into the detection box 1 in preparation for reaction.

[0048] Enzyme inhibition reaction and colorimetric detection

[0049] The detection chamber 1 contains a reaction chamber and a reagent chamber. After the liquid enters the reaction chamber, it is automatically mixed with pre-stored enzyme inhibitory reagent. The reaction module controls the reaction under constant temperature conditions. After the reaction is completed, the photoelectric colorimetric module analyzes the colorimetric channel to obtain the colorimetric value.

[0050] Results Display and Alarm Upload

[0051] The colorimetric values ​​are compared with a built-in standard curve to automatically calculate the pesticide residue concentration in the sample. The test results are displayed in real-time on a 38-inch screen, and an alarm is triggered if the detected value exceeds the limit. Simultaneously, data can be uploaded to a regulatory cloud platform via a built-in wireless communication module such as Wi-Fi / Bluetooth.

[0052] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0053] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A pesticide residue detection device for fresh produce, comprising a frame structure, a first material cylinder structure, a second material cylinder structure, and a detection box (1), characterized in that: The frame structure includes a casting block (2), and connecting pipes (3) are symmetrically arranged on both sides of the casting block (2). The connecting pipes (3) are connected to the corresponding material cylinder structure one and material cylinder structure two. A support plate (4) is provided on the top of the casting block (2). A cleaning structure is provided on one side of the top of the support plate (4), and a crushing structure is provided on the other side of the support plate (4). The cleaning structure includes a column plate one (5). A cross frame plate (6) is provided on the top of the column plate one (5). A seat plate (7) is provided at the outer end of the cross frame plate (6). The seat plate (7) is located directly above the material cylinder structure one. A liquid pipe (8) is provided on the top of the seat plate (7). A control valve (9) is provided on the seat plate (7). A nozzle (10) is provided at the bottom of the seat plate (7).

2. The pesticide residue detection device for fresh produce according to claim 1, characterized in that: The material cylinder structure includes a bottom frame (11), a column cylinder (12) is provided on the top of the bottom frame, a directional ring (13) is provided at the bottom of the column cylinder (12), and the directional ring (13) is provided with protruding teeth on the outside. A motor is provided inside the bottom frame (11), and a gear plate (14) is connected to the output end of the motor. The gear plate (14) meshes with the directional ring (13). A sliding storage frame (15) is provided on one side of the outer wall of the bottom frame (11), and a liquid collection plate (16) is provided inside the storage frame (15). A material collection mesh frame (17) is provided inside the column cylinder (12), and a drain hole is provided at the bottom end of the column cylinder.

3. The pesticide residue detection device for fresh produce according to claim 2, characterized in that: Electromagnetic grooves are provided on both sides of the column plate (5). A directional block (18) is slidably connected to the electromagnetic groove. A motor (19) is provided on the top of the directional block (18). A directional plate (20) is connected to the output end of the motor (19). A liquid storage tray (21) is connected to the outer end of the directional plate (20). A liquid pump is provided inside the liquid storage tray (21). A guide plate (22) is provided at the bottom of the liquid storage tray (21). Several guide tubes (23) are provided on the guide plate (22).

4. The pesticide residue detection device for fresh produce according to claim 3, characterized in that: The second material cylinder structure includes a second column cylinder (24) and a second bottom frame (25), with the second bottom frame (25) located at the bottom of the second column cylinder (24).

5. The pesticide residue detection device for fresh produce according to claim 4, characterized in that: The crushing structure includes a second column plate (26), on the inner wall of the second column plate (26) is a sliding groove, and a first hydraulic cylinder (27) is provided at the bottom of the sliding groove. The output end of the first hydraulic cylinder (27) is connected to a movable plate (28), and a cover plate is connected to the outside of the movable plate (28). A second motor (29) is provided at the top of the cover plate, and a shaft tube (30) is connected to the output end of the second motor (29). Several crushing blades (31) are provided on the outside of the shaft tube (30), and an alarm is provided at the top of the second column plate.

6. The pesticide residue detection device for fresh produce according to claim 5, characterized in that: A second adjusting block (32) is slidably connected to the side wall of the second column plate (26). A third motor is installed inside the second adjusting block (32), and the output end of the third motor is connected to the second adjusting plate (33). The outer end of the second adjusting plate (33) is connected to the storage tray (34), and a negative pressure pump (35) is installed on the top of the storage tray (34). An adsorption tube (36) is connected to the bottom of the storage tray (34).

7. The pesticide residue detection device for fresh produce according to claim 1, characterized in that: The top of the detection box (1) is provided with an openable cover plate (37), the detection box (1) has a reaction chamber and a reagent chamber, and the top of the detection box (1) is provided with a display screen (38).

8. A method for using a pesticide residue detection device for fresh produce, the specific steps of which include the following: Step S1: Sample preparation, taking samples of fresh vegetables or fruits, then placing them into the material cylinder structure and the cleaning structure for thorough cleaning, and collecting the waste liquid; Step S2: The cleaned sample is fed into the second material cylinder structure, and then the crushing structure is started to continue the crushing process. At the same time, the preset volume of extract is automatically added for filtration and separation. The homogenate is filtered through the negative pressure pump (35) and the adsorption tube (36) to obtain a clear test solution. Step S3: Sample addition reaction, put the liquid into the detection box (1) and introduce it into the reaction chamber, where it is automatically mixed with the enzyme reagent pre-stored in the reagent compartment to carry out the enzyme inhibition reaction; Step S4: Constant temperature reaction and colorimetric detection. After the reaction chamber reacts for a set time under constant temperature conditions, the photoelectric colorimetric module performs optical detection on each channel to obtain the colorimetric value. Step S5: Result display and upload. The colorimetric value is compared with the built-in standard curve, the pesticide residue concentration is automatically calculated, and the result is displayed on the display screen (38). If the value exceeds the standard, an alarm is issued.

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